Donahue said the exchange planned to continue the expansion of its electronic trading platform over the coming months, as well as targeting Europe and Asia for new business.

CME, which is believed to be seeking a partnership or takeover deal with rival the Chicago Board of Trade, amassed an additional $70m in working capital during the second quarter, giving it a total working capital pool of $809m at June 30.

The CBOT, which is mulling partnership approaches as well as a possible flotation, has set a price range for the float valuing it at about $1.8bn.